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Dimming LED lamps is not as simple as dimming halogen lamps, where a simple change in the voltage will provide smooth dimming. This is mainly due to the fact that LEDs require a constant current to operate optimally. The two main methods of dimming the light emitted from the LED are analog intensity control and pulse-width modulation (PWM). The table here lists the pros and cons of both methods. The analog method changes the amount of current that passes through the LED. This, however, leads to a color shift in the light emitted from the LED. In contrast, PWM dimming maintains a constant current but rapidly turns the LEDs on and off to adjust the intensity. This method does not have the side effect of color shifting the emitted light.
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